1990 Mazda B2200 Q&A

1990 Mazda B2200 Question: how to get the rpm and timing right without accelerating the engine too much??

put a ground wire from the green test connector.Set the rpm to 750 on idle and timing on 6. As soon I disconnect the ground wire,the engine accelerate and rpm goes over 800.The repair manual ask me to ground the test connector so i did.Just want to have my rpms right to smog check. Thanks. -
Answer 1
Are you setting the idle speed with the ground connected or just the 'base' timing? -
Comment 1
Im setting idle speed and making sure timing is correct.Thats what the underhood label says: idle speed 750rpm and timing on 6 degrees. Just dont understand what is that ground wire connector for ? why do i need to ground it ?? -
Comment 2
That is for setting the 'base' ignition timing only. Disconnect , then adjust idle. What else was done , leading to the need to make adjustments? -